| This is the
typical wiring diagram for the R7184P or U controls for a typical oil-fired boiler. Note: The R7184P and U controls have
a valve-on delay (prepurge) and a motor-off delay (post-purge) feature. As with
the R7184B control, this requires the installation of a solenoid valve. When wiring
the R7184P or U control, you will have a red wire from the control that connects
to the limit and a black wire that connects to constant L1 power. This must be done to achieve the motor-off delay or post-purge feature. A common wiring error involves connecting the black wire from the R7184P or U control to the limit of the appliance. If this happens you will fail to have motor-off delay or post-purge feature. <back
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